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1985 Nissan Truck power problem

Tiny
PAFIZZ
  • MEMBER
  • 1985 NISSAN TRUCK
  • 231,000 MILES
Replaced coil, fuel pump/filter, fuel relay. Idles great, takes off good, at 35mph starts bucking as if running out of gas. Let off gas an is fine. Can go 30 with easy fuel acceleration. Give it lots of gas sitting in driveway and no problem. Seems to have a problem under a load though.
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Sunday, August 25th, 2013 AT 9:54 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Check plugs, wires. Also, check the cat converter back pressure. It may be partially clogged

Roy
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Sunday, August 25th, 2013 AT 9:57 AM
Tiny
PAFIZZ
  • MEMBER
  • 2 POSTS
Replaced plugs / wires. Still same problem
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Sunday, August 25th, 2013 AT 4:21 PM
Tiny
TOWER31
  • MEMBER
  • 1 POST
I had the same issue. It is the fuel control box(valve) under the right side of the dash board. It is approx 3" by 3" and it runs about 80 bucks. My truck would the exact same thing before I googled the issue. And the good part is it is only two wires to deal with! Hope this fixes your problem. And you gas mileage will increase a ton too! :)
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Monday, October 7th, 2013 AT 6:49 PM

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